Question:medium
Identify the structure marked by the red arrow in the given image.
Identify the structure marked by the red arrow in the given image.
Show Hint
The C-shaped tract from hippocampus to mammillary bodies is the fornix.
Updated On: Jun 23, 2026
- Great vein of Galen
- Pineal gland
- Fornix
- Falx cerebri
Show Solution
The Correct Option is C
Solution and Explanation
Step 1: Read the shape. A slender C-shaped white matter arch curving beneath the corpus callosum is the fornix, the hippocampal output pathway.
Step 2: Follow its course. It runs from the hippocampus toward the mammillary bodies of the hypothalamus and the anterior thalamic nuclei, linking memory circuits of the limbic system.
Step 3: Track its build-up. Myelinated fibres start as the alveus, condense into the fimbria, then form the crus, which arches forward through the body to the anterior columns that dive into the hypothalamus.
Step 4: Reject the distractors. The vein of Galen is vascular, the pineal gland is a small midline gland, and the falx cerebri is a dural partition, so only the fornix fits the arrowed tract.
$hippocampus \rightarrow fornix \rightarrow mammillary\ bodies$
\[\boxed{Fornix}\]
Step 2: Follow its course. It runs from the hippocampus toward the mammillary bodies of the hypothalamus and the anterior thalamic nuclei, linking memory circuits of the limbic system.
Step 3: Track its build-up. Myelinated fibres start as the alveus, condense into the fimbria, then form the crus, which arches forward through the body to the anterior columns that dive into the hypothalamus.
Step 4: Reject the distractors. The vein of Galen is vascular, the pineal gland is a small midline gland, and the falx cerebri is a dural partition, so only the fornix fits the arrowed tract.
$hippocampus \rightarrow fornix \rightarrow mammillary\ bodies$
\[\boxed{Fornix}\]
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